A post-processing beam hardening correction method for axial computed tomography

A post-processing method for correcting the beam hardening artifacts in fan beam axial computed tomography is presented. The original uncorrected CT image is reconstructed using filtered backprojection algorithm. Image segmentation technique is adopted to exact the high density object from the uncorrected CT image. The original and high density image are reprojected individually. Certain correction methods are employed on the two projection data sets to get corrected projection data. A second reconstruction is performed to reconstruct a correction image. The original CT image is corrected by summing the weighted correction image. Experimental results and analysis are given.